php - PreAuthorize annotation of Symfony2 JMSSecurityExtraBundle not working

Using the JMSSecurityExtraBundle of Symfony2 I try to create my own expression method and bind it in a controller using the PreAuthorize annotation.

I don't know why but the method is never fired, and the security bundle while trying to evaluate the PreAuthorize annotation concludes with a "Token does not have the required roles.". Seems like is trying to validate roles and not to resolve the PreAuthorize expression.

Example about what I'm trying to do:

<?php

namespace Acme\HelperBundle\Security;

use Symfony\Component\DependencyInjection\ContainerInterface;
use JMS\DiExtraBundle\Annotation as DI;

/** @DI\Service */
class RequestAccessEvaluator
{
    private $container;

    /**
     * @DI\InjectParams({
     *     "container" = @DI\Inject("service_container"),
     * })
     */
    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    /** @DI\SecurityFunction("isAllowed") */
    public function isAllowed()
    {
        return true;
    }
}
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My Controller:

   /**
     * 
     * @PreAuthorize("isAllowed()")
     * @Route("/bla/{id}")
     * @Method({"POST"})
     * @return json
     */
    public function postBlaAction(Request $request, $id)
    {
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